FWIW if I find I am not playing a game (e.g. I have played it "enough") out it goes.
What is the worst case scenario? I pick it up again ; maybe pay less, maybe pay more? If I want it so bad to buy it again does it matter?
Realistically, either I want to keep a game until I die, or I want to play it to death, then move it on. And then do it again! The latter seems more fun. I tend to maybe buy/sell one game a year on average, so I am not some hyper trader.
But I am not a super hoarder either....